Name bobby for looms



Dec. 3, 1929. A. A. GORDON NAME DOBBY FOR LOOMS Filed Nov. 12, 1928 Patented Dec. 3, 192% Pag it] it ALBERT A. GORDON, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOCI/f NOR-KS, OF "WORCESTER, I/IASSACHUSETTS, A CORPORATION OF MASSACHUSETTS NAIVIE DOBBY FOB LOOMS Application filed November 12, 1928.

This invention relates to improvements in (lobbies for looms more particularly designed for the weaving of names in selvagcs, etc., and it is the general object of the invention to provide an improved form of auxiliary finger for use in a type of mechanism set forth in my co-pending application Ser. No. 246,953 filed January 16, 1928.

In the form of dobby set forth in that application there is provided a set of auxiliary lingers which cooperate with a top pattern surface, said fingers being movable either to operative or inoperative position. \Vhen in the operative position each finger when depressed will act through a vertical rod to cause movement of the corresponding dobby hook and when in inoperative position will be out of the range of action of the top or auxiliary pattern surface. 1 have found that in certain instances the weight of the auxiliary finger resting on the upright rods causes slnggishness in the return of the main dobby fingers to their lower position, and it is accordingly an important object of my presentinvention so to form the auxiliary fingers that they will exert practically no force on the rods when in inoperative position or when in operative position but not acted upon by the upper pattern surface.

The auxiliary fingers as shown in my aforesaid application are mounted on a rod supported by arms which swing around a fixed pivot. The arcuate movement of the axes of the fingers results in a corresponding movement on that end of the finger which cooperates with the upright rods, and it is accordingly a further object of my present invention to form the auxiliary fingers so that they will compensate for the arcuate movement of their axes and act to hold their upright rod engaging portions in substantially the same horizontal position.

I have found also that said auxiliary fingers operate more efficiently when they have a fiat upper pattern engaging surface and a grooved lower surface to cooperate with the aforesaid upright rods, and it is accordingly a more detailed object of my invention to provide a dobby finger formed thus.

50 With these and other objects in view which Serial No. 318,915.

will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings, wherein a convenient embodiment of my invention is set forth,

Fig. 1 is a side elevation of enough of the dobby shown in my aforesaid application to illustrate my present invention,

Fig. 2 is a detailed front elevation of two adjacent auxiliary fingers and their corrcspending rods taken in the direction of arrow 2, Fig. 1,

Fig. 3 is a detailed top plan view taken in the direction of arrow 3, Fig. 1,

Fig. at is a side elevation of one of the auxiliary fingers, and

Fig. 5 is a top plan view of the finger shown in Fig. 1.

It is to be understood that the dobby shown herein is capable of producing two weaves, one governed by the mainpattern surface to weave a name, for instance, and the other controlled by the auxiliary pattern surface to weave the space between names. Control is passed from the main to the auxiliary and back to the main pattern surface by means set forth in my aforesaid application. As these means form no part of my present in vention they are not described in detail.

Referring particularly to Fig. 1, I have shown a loom frame to which are secured the dobby plates or sides 11. A main pattern cylinder 12 is provided with a main pattern surface indicated at 13 and may be actuated by means of a ratchet 14. Said cylinder is supported on a shaft 15 rotatably mounted in the dobby sides or frame and said cylinder may move around the axis of the shaft 15 under influence of a pull pawl 16 cooperating with the ratchet 14:.

Lower or main dobby fingers 17 are pivoted on a pin 18 and rise and fall under in fluence of the main pattern surface 13. Certain of said main dobby fingers have upwardly inclined portions 19 while others have the substantially horizontal extensions 20. Said extensions 19 and 20 cooperate with those shown in my aforesaid application.

in Fi vertica ifter rods 21 which move through 1 1 guides 22 and The harness levers 25 are pivotally mounted on acks 26 which in turn move about a fired pin 27 supported by the dohhy frine. Each yaclr has p1voted thereto a dohby haclr lever 31 to which are pivoted upper and lower hooks 32 and 33, respectively. These hooks are controlled by the fingers and move into the path of a dohhy knife K shown in dotted lines in Fig. l, to eircct lifting movement of the harness levers 25.

The auxihar control for the rods prlses a set of auxiliary lingers 70 which pivoted at 69 to a pair spaced nor arms 67 which are pivoteo about a l 68. Each of said auxiliary fingers is provid with an operative surface ?1 s n d a suppo. tail 72. Rigid with one arm (3-; 15 a arm A which has operative connection with a lever 60.

An upper pattern cyhnder has a pattern surface 51 provided with to usual dohhy pegs 73, said cylinder rotatnr around the stud 53 by means of a ratchet and pawl when the latter is called into action.

in the operation of the matter thus fa r descrlhed it is to he understood that th auitiliary fingers 70 may move l'iorizoutally to the left from the position shown in Flg. l where the surfaces 71 will be out of the path of auxiliary pattern chain. The con ections whereby lever 1s rocked to cause os :illation of the arm 6? aresubstantially the as Certain other parts shown in the drawings are for the purpose of identifying the present disclosure with my previous applicaton and form no part of my present invention.

As previously stated the fi: have i practice shown a tendency weight to lift the main fingers 1'? fore render the latter uncertain in their re turn to normal down position and it is important object of my present inven to correct this tendency hy counter-i the levers 70530 that they will he ineexert undesired do\vnw-.--'d str I upright rods 21. Accordingly, in carrying out my invention, I form the ar l' shown in Figs. t and wit. through which the rod 69 may extend. linger has a lower edge 81 which as shown 2 is preferably coi'xcave so to insure proper registry with the top of the wire E21. That portion of the finger which lies to tl right of the hearing as shown in preferably made as light as is consi requisite strength. There is'eI-J, left of the hearing a counterweight sufficient weight to hold the small end t right normally in raised position.

In order to support the counterweights ll provide a bar 83 which extends across the back of the dohhy and has extended th;

ably rounded lower edge of ly one point only. counterweight as shown in Flo r ably inclined downwardly and inwardly with respect to the outer end of the counterweight, said surface being indicated at 86 and resting on the bar 83.

As shown in Fi 2 the operati' e end of the auxiliary finger is spaced slightly above upper end of the rod 21 so as normally to exert no downward pressure whatever upon said rods. In this way the lower fingers l? and therefore the indications given to the hooks ant 33 will he more ac urate than is possible in the dohliy set forth in my aforesaid application.

The purpose of forming the lower portion of the counterweight with the edge as shown in Fig. at is to insure proper positioning of the edge 81 with respect to the rods 21. It will he noted that the rod (35) moves around stud 68 as a center so tha the hen DQS 80 are lifted when the fingers more to left from the posit on shown in 1. llnzler surface 85 inclined. dowi wardly slightly more than the path of movement of the rod 69. When there is suflicient clearance between the pe s 73 and the surface 71 of the auxiliary fingers it not uece .,.-.ry to have the lower surf ce 86 of the counterweight as accurately made shown to clear the path of movement of. the rod ($9.

It is to he understood that in operation the auxiliary fingers will be shifted into an d out of operative relation with respect to the auxiliary pattern surface 51 and that when the fingers are in the position shown in 1 the pegs 73, when in their lowest pos'tion will depress selected lingers 70 and raise the corresponding counterweights 82 thus acting through the rods 21 to lift the corresponding: main fingers 17 and lower the associated hooks. WVhen the mechanism operates to shift the control of Weave from the upper surface 51 to the lower surface 13 there will he a corresponding movement to the left 0 i the part of the auxiliary fingers and the surfaces 86 will slide over the upper edge of the bar 83 to maintain said fingers 70 in. their proper relation relatively to the auxiliary pattern surface and the upright rods 21.

A detailed feature of my invention relates to the method of forming the upper surface 71 of the finger 7 0 and by reference to Fig. 52 it will be seen that said surface is preferably smooth and flat so that the pegs 73 if not accurately aligned centrally with respect to the fingers will nevertheless be able to effect depression of the latter. It will also be seen that a small vertical bar 88 may be cast to cooperate with the adjacent finger to reduce friction. A shallow hub 89 around the bearing may also be provided for the same purpose.

From the foregoing it will be seen that I have provided a dobby mechanism with auxiliary fingers so constructed and controlled as to be normally out of contact with the upright rods except as such times as the latter are to be intentionally subjected to a downward pressure for the purpose of indicating the hooks. It will further be seen that the counterweights and the su porting bar are so formed that they cooperate with each other to keep the auxiliary hooks properly related with respect to the auxiliary pattern surface and the upright rods. Furthermore, it will be seen as a detailed feature of my invention that the upper sur face 71 of the auxiliary fingers is preferably smooth although the lower edge 81 may be grooved to effect alignment and proper cooperation between the auxiliary fingers and the rods 21.

Having thus described my invention it will be seen that changes and modifications may he made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a loom dobby, a pattern surface, a set of dobby fingers to cooperate with the pattern surface, a pivotal support for the fingers movable to present said fingers into operative and inoperative relationship with respect to the pattern surface, a control rod to be depressed by said fingers, a counterweight rigid with each finger, and a support for the counterweights tending to hold the latter normally out of contact with its corresponding control rod.

2. In a loom dobby, a movable pattern 5 surface, a set of dobby fingers to cooperate with the surface, a movable support for said fingers about which the latter may move pivotally, control rods to cooperate with the fingers, a counterweight rigid with each finger and a support for the counterweights to en a e the latter so that normall said n a fin 'ers are s aced above the control rods.

D I 3. In a loom dooby, a movable pattern surface a set of dobb 1 fin ers to coo erate with the surface, a movable support for said fingers about which the latter may move pivotally, control rods to cooperate with the fingers, a counterweight rigid with each finger, and a support for the counterweights to engage the latter so that normally said the fingers move into and. out of operative position with respect to the pattern surface, said inclined surface cooperating with the support to keep said fingers spaced above the rods as the fingers move toward and from operative position.

i. In a loom dobby, a movable pattern surface, a set of dobby fingers to cooperate with the surface, a movable support for said fingers about which the latter may move pivotally, control rods to cooperate with the fingers, a counterweight rigid with each finger, and a support for the counterweights to engage the latter so that normally said fingers are spaced above the control rods,

the under surface of the counterweight being inclined in the same general direction as the path through which the pivotal support for the fingers moves and cooperating with the support to hold the fingers spaced above the control rods as the fingers move toward and from operative position relatively to the pattern surface.

5. In a loom dobby having a main set of dobby fingers and control rods extending upwardly therefrom, a pattern surface, a. set of auxiliary fingers to cooperate with the pattern surface and having op rative relation with the rods to control he position of the main dobby fingers, a pivotal support for the auxiliary fingers, said support being movable to carry the auxiliary lingers into and out of operative relation with respect to the auxiliary pattern surface, a counterweight formal integral with each auxiliary finger, and a support for all the counterweights to position;

the latter so that normally the auxiliary fingers are spaced slightly above the rods for all positions of the pivotal support for the auxiliary fingers.

6. In a loom dobby having a main set of dobby fingers and control rods extending upwardly therefrom, an auxiliary pattern surface, a set of auxiliary fingers to cooperate with the pattern surface and capable of having operative relation with the rods to control the position of the. main dobby fingers, a piw otal support for the auxiliary fingers, said support being movable to carry the auxiliary fingers into and out of operative relation with respect to the auxiliary pattern surface, a counterweight formed integral with each auxiliary finger, and a support for all the counter-weights to position the latter so that normally and during movement of the auxiliary fingers toward and from operative position relatively to the pattern surface the auxiliary fingers Will be spaced sligz'htlv abom the rods.

in a loom dobby having a main set of (lobby fingers and control rods extending up- Wardl' therefrom an auxiliar )attern surface, a set of auxiliary fingers to cooperate with the pattern surface and capable of having operative relation with the rods to con trol the position of the main dobby fingers, a pivotal support for th auxiliary fin 'ers,

said support being inox le to carry the auxiliary fingers into and o of operative rela- LLL tion With respect to the auxiliary pattern surface, a counteriveig t for each auxiliary finger, a fixed support on which the counterveights may rest, each counterweight having on the under side thereof an inclined surface to have sliding contact With the support as the auxiliary fingers move toward and from operative position, said inclined surface cooperating With the support to keep the auxiliary fingers spaced normally above the rods as said fingers move toward and from operative position.

8. In a loom (lobby having a main set or" (lobby fingers, rods extending upwardly from tire fingers and movable longitudinally to cause movements of the main fingers, an auxiliary pattern chain having pattern indicat ing elements located above the rods, a xiliary fingers located between the auxiliary pat-tern surface and the rods, said fingers having their under portions provided With a longitudinal groove to have cooperation with the rods and said fingers having flat upper surfaces to cooperate with the pattern elements, and a movable support for the fingers whereby the fingers are movable in a direction parallel to the grooves.

9. In a loom dobby having main dobby fingers, a set of rod elements extending upwardly from the fingers and movable longitudinally to effect movements of the fingers, an auxiliary pattern surface having a set of pattern elements located above the rod ele ments, auxiliary dobby fingers located between the rod elements and the pattern chain elements, that portion of the auxiliary finers adjacent one set of elements having a longitudinal groove to receive said one set of elements and that portion of the auxiliary fingers adjacent the other set of elements being flat, whereby said other setof elements may assume a plurality of positions laterally with respect to the fiat surface While the said one set of elements act to deterniline the lateral position of the auxiliary fingers, and a inevable support for the fingers whereby the latter *are movable in a direction parallel to the grooves.

In testimony Whereot I have hereunto atfixed my signature.

ALBERT A. GORDON. 

